coreboot: add a place to choose romstage loader

Instead of always loading romstage from cbfs provide a
way, similar to ramstage and payload, for other
program loaders to intervene. For now, only the cbfs
loader is consulted.

TEST=Booted to end of ramstage on qemu-armv7

Change-Id: I87c3e2e566d7a0723e775aa427de58af745ecdd5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9934
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

1 files changed, 25 insertions, 7 deletions

diff --git a/src/lib/loaders/load_and_run_romstage.c b/src/lib/loaders/load_and_run_romstage.c
index 9bd9603bab..1c2ed77abf 100644
--- a/src/lib/loaders/load_and_run_romstage.c
+++ b/src/lib/loaders/load_and_run_romstage.c
@@ -26,20 +26,38 @@
 #include <program_loading.h>
 #include <timestamp.h>
 
+extern const struct prog_loader_ops cbfs_romstage_loader;
+
+static const struct prog_loader_ops *loaders[] = {
+	&cbfs_romstage_loader,
+};
+
 void run_romstage(void)
 {
+	int i;
 	struct prog romstage = {
 		.name = CONFIG_CBFS_PREFIX "/romstage",
 		.type = PROG_ROMSTAGE,
 	};
 
-	timestamp_add_now(TS_START_COPYROM);
-	if (cbfs_load_prog_stage(CBFS_DEFAULT_MEDIA, &romstage) < 0) {
-		if (IS_ENABLED(CONFIG_BOOTBLOCK_CONSOLE))
-			die("Couldn't load romstage.\n");
-		halt();
+	for (i = 0; i < ARRAY_SIZE(loaders); i++) {
+		const struct prog_loader_ops *ops;
+
+		ops = loaders[i];
+
+		printk(BIOS_DEBUG, "Trying %s romstage loader.\n", ops->name);
+
+		timestamp_add_now(TS_START_COPYROM);
+
+		if (ops->prepare(&romstage))
+			continue;
+
+		timestamp_add_now(TS_END_COPYROM);
+
+		prog_run(&romstage);
 	}
-	timestamp_add_now(TS_END_COPYROM);
 
-	prog_run(&romstage);
+	if (IS_ENABLED(CONFIG_BOOTBLOCK_CONSOLE))
+		die("Couldn't load romstage.\n");
+	halt();
 }